US4893674A - Method of producing a tubular distributor of a heat exchanger from juxtaposed porous strips of material - Google Patents

Method of producing a tubular distributor of a heat exchanger from juxtaposed porous strips of material Download PDF

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Publication number
US4893674A
US4893674A US07/259,183 US25918388A US4893674A US 4893674 A US4893674 A US 4893674A US 25918388 A US25918388 A US 25918388A US 4893674 A US4893674 A US 4893674A
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US
United States
Prior art keywords
strips
tubes
distributor
heat exchange
porous structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/259,183
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English (en)
Inventor
Klaus Hagemeister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines GmbH
Original Assignee
MTU Motoren und Turbinen Union Muenchen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Motoren und Turbinen Union Muenchen GmbH
Assigned to MTU MOTOREN- UND TURBINEN-UNION MUNCHEN GMBH reassignment MTU MOTOREN- UND TURBINEN-UNION MUNCHEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAGEMEISTER, KLAUS
Application granted granted Critical
Publication of US4893674A publication Critical patent/US4893674A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0221—Header boxes or end plates formed by stacked elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0243—Header boxes having a circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/02—Streamline-shaped elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/454—Heat exchange having side-by-side conduits structure or conduit section
    • Y10S165/471—Plural parallel conduits joined by manifold
    • Y10S165/481—Partitions in manifold define serial flow pattern for conduits/conduit groups
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49366—Sheet joined to sheet
    • Y10T29/49368—Sheet joined to sheet with inserted tubes

Definitions

  • the invention relates to a method of producing a tubular fluid distributor of a heat exchanger from a succession of juxtaposed strips in which the ends of heat exchange tubes are mounted in sealed relation.
  • An object of the present invention is to provide a method which avoids the problems concerning manufacturing tolerances of the layers which make up the tubular distributor, and in the location of the openings for receiving the ends of the heat exchange tubes.
  • a further object of the present invention is to provide a method in which the tube ends of a tube matrix of a heat exchanger can be effectively secured in integrated fashion in a tubular distributor structure which is produced from elements which avoid the use of solid structural parts.
  • porous structure is then filled with a liquid, metallic material to integrate the fibers of the strips with one another and with the ends of the tubes to form a solid assembly in which the ends of the tubes are sealingly secured.
  • the invention is characterized in that instead of using annular strips of solid material, the strips are made of fiber material.
  • the fiber material is compressed under the action of axial compressive forces and the fiber material completely surrounds the interposed heat exchange tubes. The compressing of the fiber material is greatest locally where the surfaces of adjacent tubes in the heat exchanger field are at the smallest distance from each other.
  • the metallic material acts to fill the hollow spaces in the fiber structure and produce a secure, integrated connection between the surfaces of the tubes and the surrounding fiber material.
  • the strips are annular in form i.e. cylindrical, oval, rectangular, and in the circumferential direction, one portion of the fiber material is desirably oriented in order to resist high circumferential forces which are developed due to internal pressure in the distributor during operation of the heat exchanger. Another portion of the fiber material extends in bristle-like manner from the lateral surfaces of each fiber strip so that upon assembly, the bristles of adjacent strips interpenetrate one another and, after filling by the metallic matrix, provide strength for resisting longitudinal forces applied to the distributor.
  • the bristle structure furthermore insures that the regions which are least compressed upon assembly, particularly at the leading and trailing edges of the heat exchange tubes, contain an adequate volume of the fiber material.
  • the fiber material is suitably heat resistant to the operating temperatures acting on the structural parts, but it need not necessarily withstand oxidation and corrosion.
  • metallic fibers can be used as well as ceramic and carbon fibers.
  • the annular fiber strips may further be advantageous, in accordance with the invention, to surround the annular fiber strips with solid annular strips.
  • the width of the solid strips corresponds to the narrowest local spacings of the heat exchange tubes in the heat exchange field, so that upon assembly, when the strips are pressed together, the solid strips will assure obtaining the required spacings. Since, in such arrangement, the solid strips must conform to the undulating shape around the heat exchange tubes in the tube matrix in the circumferential direction, it is necessary to shape the solid strips before assembly or to make the solid strips of deformable material so that they can assume the undulating shape during compression of the strips.
  • a shaped injector apparatus is introduced into the tubular distributor, and the molten matrix material is injected and fills the fiber structure by capillary action whereupon the material solidifies and unites with the fibers and the tube surfaces. It may be desirable to close the ends of the tubes which extend into the interior of the distributor and reopen the tubes after completion of the filling operation.
  • Solid annular elements which may surround the fiber structure on the inside and on the outside may be made of a material which is fusible upon heating in the oven, i.e. solder material.
  • the fusible material can penetrate by capillary action into the fiber structure to fill the matrix volume and produce intergrated bonds with the fiber material and the tubes.
  • the heat exchange tubes and the fiber material can be subjected to a surface pretreatment in order to obtain better wetting and binding with the matrix filling material.
  • FIG. 1 is a perspective view, partly broken away, of a heat exchanger of cross-counterflow type for which the method of the invention is adapted.
  • FIG. 2 is a fragmentary sectional view through the heat exchange tubes of the heat exchanger in FIG. 1.
  • FIG. 3 is a sectional view, on enlarged scale, showing profiled heat exchange tubes interposed in rows between juxtaposed strips of material in an initial phase of the method of the invention.
  • FIG. 4 is a perspective view diagrammatically illustrating a
  • FIG. 5 is a sectional view of the assembly in FIG. 3 after application of compression forces and deforming of the strips of material.
  • FIG. 6 is a transverse section taken in the direction of arrows 6--6 in FIG. 1 through the distributor showing the tubes extending into the distributor.
  • FIG. 7 shows the assembly in FIG. 5 in which undulating annular strips of solid material are mounted at the outer surface of the distributor.
  • FIG. 8 is a view similar to FIG. 6 in which annular strips of solid material are employed in the manner shown in FIG. 7 at both the inner and outer surfaces of the tubular distributor.
  • FIG. 1 shows a heat exchanger 1 for carrying out heat exchange on a cross-counterflow basis between an external fluid G flowing around a matrix 2 of heat exchange tubes 3 which convey a second fluid D therein.
  • the tubes 3 are formed with U-shaped bends and have straight legs connected respectively to a duct 4 in which fluid D is introduced in cold state and a duct 5 from which heated fluid is fed at D' to a utilization means (not shown).
  • the external fluid G can be hot exhaust gases and the fluid D can be compressed air.
  • the ducts 4 and 5 are arranged in separated relation in a common distributor or manifold 6.
  • the straight legs of tubes 3 extend laterally from duct 4 of distributor 6, in parallel relation to one another, up to the U-shaped bend regions in which the flow of compressed air is reversed by 180° and the compressed air flows in the other straight legs of the tubes 3 to the duct 5.
  • the path of flow of the compressed air D in the tubes 3 is shown by arrows in FIG. 1.
  • a respective tube matrix 2 is disposed at each lateral side of the distributor 6 and both tube matrixes are traversed by the hot gases G in a direction perpendicular to a median plane disposed between the parallel legs connected to ducts 4 and 5.
  • the tubes 3 are streamlined in cross-section in the direction of flow of the hot gases G.
  • the tubes 3 are arranged in the matrix 2 in rows and columns and the tubes in the rows overlap or interpenetrate between one another to provide smooth flow paths for the gases G.
  • two or more separate distributors or collector tubes can be provided for the respective supply of compressed air into the matrix 2 and the removal of heated compressed air from the matrix 2.
  • the invention is directed to the manufacture of sheet structure 10 of the common distributor or collector tube 6 and is also applicable to the manufacture of a sheet structure for individual distributors of a heat exchanger of the type discussed above.
  • the sheet structure 10 forms the wall of distributor 6 and as shown in FIG. 5 comprises an integrated assembly of successive layers 11, 12 and 12, 13 of strips of material in which the heat exchange tubes 3 are embedded in fluid-tight manner.
  • Each of the layers is made of fiber material uniformly distributed in the layer.
  • the fibers can be made of metallic material or wires, ceramic material, such as partially stabilized zirconium oxide or carbon.
  • layers 11', 12', 13' are disposed in spaced relation around the rows of tubes 3 as shown in FIG. 3 so that the tubes 3 are interposed between adjacent, juxtaposed layers.
  • the layers are annular and the ends of the tubes 3 extend through the layers into the interior of the distributor 6.
  • An axial compressive force is applied to the end layers at P, P' to squeeze the strips and cause them to deform around the tubes such that each strip accomodates itself to one-half the cross-section of the tubes of each row while its fibers interconnect with the fibers of the adjacent strips. In this way, a porous structure is formed in which the tubes are encased.
  • a molten metallic material is then introduced into the porous structure as a matrix material to integrate the fibers of the layers to one another and to the ends of the tubes as a solid assembly in which the ends of the tubes are sealingly integrated.
  • each layer for example, layer 12' is formed from interwoven fiber plies or sublayers having main fibers 14 extending in the circumferential direction of the distributor and secondary fibers 15 extending transverse thereto.
  • the secondary fibers 15 interengage one another in the regions outside the tubes.
  • the secondary fibers 15 of each strip intimately engage one another by interpenetration of the fiber bristles with one another. In this way an interbraiding of the fibers is obtained without formation of gaps even at the oval, streamlined ends of the tubes.
  • the planes of contact 16 are aligned in the longitudinal planes of symmetry E (FIG. 5) of each row of tubes.
  • cover elements 18, 19 can be respectively mounted on the outer and inner surfaces of the distributor 6 to cover the layers 11, 12, 13 formed from the fiber material.
  • the layers 11, 12, 13 can be covered in whole or in part by the cover elements 18, 19.
  • the cover elements are composed of solid metallic ring elements and as seen in FIG. 7 for cover element 18, the ring elements are shown at 17 and are formed as undulating members which collectively surround the tubes.
  • the ring elements 17 can serve to stiffen the structure of the distributor and to protect the layers of fiber material from environmental and temperature influences.
  • the ring elements 17 can also assist in the filling operation of the matrix material by preventing outflow of the injected molten material.
  • the ring elements 17 are arranged exclusively at the inner surface of the distributor to prevent outflow of the metallic material. After the filling operation is completed the ring elements 17 can be removed.
  • the metallic ring elements 17 are made of deformable material and when the layers 12',13' are deformed under compressive forces, the ring elements 17 are also deformed to undulated shape while assuring the necessary spacing of the tubes 3 in the distributor 6.
  • the metallic ring elements 17 can be initially undulated or preformed in accordance with the final shape and to be placed on the tubes at the inner and outer surfaces of the distributor 6 over the fiber layers 11, 12, 13 before filling with the metallic material.
  • the metallic ring elements 17 can be made of the material which is to fill the porous structure.
  • the ring elements 17 are placed on the tubes at the inner and outer surfaces of the porous structure and the ring elements 17 are of undulating shape to conform with the deformed layers.
  • An extremely practical manner of effecting the filling operation is to make the metallic ring elements 17 of a meltable matrix material and to heat the assembly in an oven to melt the matrix material and achieve filling of the porous material.
  • a metallic composite material (matrix) can be injected in molten form, within a vacuum furnace, at the inner and outer surfaces of the distributor through oval shaped injectors which move over the undulated deformed layers of the porous structure (FIG. 5).
  • the ends of the profiled tubes 3 of the matrix which are open at the interior of the distributor can be closed by a metallic filling operation from within the distributor and after filling of the porous structure, the tube ends can be reopened by machining.
  • the metallic material which fills the porous structure as a matrix metal can be an aluminum alloy.
  • the distributor 6 has been shown as a cylindrical element in FIGS. 1, 6 and 8, however, it can have any tubular shape and, for example, it can be square or rectangular.
  • the process of filling the porous structure with the matrix metal can be carried out continuously over the entire circumference of the porous distributor structure.
  • the ring elements 17 can be made of a fiber-reinforced plastic material or of ceramic material.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
US07/259,183 1987-10-23 1988-10-18 Method of producing a tubular distributor of a heat exchanger from juxtaposed porous strips of material Expired - Lifetime US4893674A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3735846 1987-10-23
DE19873735846 DE3735846A1 (de) 1987-10-23 1987-10-23 Verfahren zur herstellung einer rohrbodenstruktur eines waermetauschers

Publications (1)

Publication Number Publication Date
US4893674A true US4893674A (en) 1990-01-16

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ID=6338896

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/259,183 Expired - Lifetime US4893674A (en) 1987-10-23 1988-10-18 Method of producing a tubular distributor of a heat exchanger from juxtaposed porous strips of material

Country Status (5)

Country Link
US (1) US4893674A (de)
EP (1) EP0313038B1 (de)
JP (1) JPH01147295A (de)
DE (2) DE3735846A1 (de)
ES (1) ES2019682B3 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103559A (en) * 1989-05-05 1992-04-14 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Method for making heat exchanger having at least two collecting pipes
US5177865A (en) * 1989-05-05 1993-01-12 Mtu Motoren-Und Turbinen-Union Method for making heat exchanger having at least two collecting pipes
US5269276A (en) * 1992-09-28 1993-12-14 Ford Motor Company Internal combustion engine fuel supply system
US20040035562A1 (en) * 2002-07-12 2004-02-26 Haruyuki Nishijima Heat exchanger for cooling air
US20060225405A1 (en) * 2004-04-22 2006-10-12 Cuva William J Cooling scheme for scramjet variable geometry hardware
US20090133380A1 (en) * 2006-05-09 2009-05-28 Mtu Aero Engines Gmbh Gas Turbine Engine
US20170115065A1 (en) * 2015-10-22 2017-04-27 Hamilton Sundstrand Corporation Heat exchangers
US20170205157A1 (en) * 2016-01-14 2017-07-20 Hamilton Sundstrand Corporation Thermal stress relief for heat sinks
EP4089273A1 (de) * 2021-05-14 2022-11-16 Raytheon Technologies Corporation Rohrhalterung für wärmetauscher
EP4089356A1 (de) * 2021-05-14 2022-11-16 Raytheon Technologies Corporation Rohrhalterung für wärmetauscher

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322431C2 (de) * 1993-07-06 1997-04-10 Mtu Muenchen Gmbh Kühlstruktur und Verfahren zu ihrer Herstellung
DE102010025587A1 (de) * 2010-06-29 2011-12-29 Mtu Aero Engines Gmbh Gasturbine mit Profilwärmetauscher
DE102010025998A1 (de) * 2010-07-03 2012-03-29 Mtu Aero Engines Gmbh Profilwärmetauscher und Gasturbine mit Profilwärmetauscher

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4512069A (en) * 1983-02-04 1985-04-23 Motoren-Und Turbinen-Union Munchen Gmbh Method of manufacturing hollow flow profiles
US4577684A (en) * 1983-08-12 1986-03-25 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Profiled-tube heat exchanger
US4597436A (en) * 1982-11-19 1986-07-01 Klaus Hagemeister Tubular distributor arrangement for a heat collector vessel
US4698888A (en) * 1984-12-22 1987-10-13 Mtu Motoren-Und-Turbinen Union Munchen Gmbh Method for mass producing superimposed annular elements of a tubular manifold or collector vessel of a heat exchanger
US4800955A (en) * 1986-10-20 1989-01-31 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Heat exchanger
US4809774A (en) * 1985-12-12 1989-03-07 Mtu Motoren-Und Turbinen- Union Munchen Gmbh Reversal chamber for a tube matrix of a heat exchanger

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2026088A1 (en) * 1968-12-13 1970-09-11 Dunlop Co Ltd Metallic foam heat transfer element
US3825063A (en) * 1970-01-16 1974-07-23 K Cowans Heat exchanger and method for making the same
FR2337867A1 (fr) * 1976-01-12 1977-08-05 Chausson Usines Sa Echangeur de chaleur a collecteurs epais
DE2907810C2 (de) * 1979-02-28 1985-07-04 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Wärmetauscher zur Führung von Gasen stark unterschiedlicher Temperaturen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597436A (en) * 1982-11-19 1986-07-01 Klaus Hagemeister Tubular distributor arrangement for a heat collector vessel
US4512069A (en) * 1983-02-04 1985-04-23 Motoren-Und Turbinen-Union Munchen Gmbh Method of manufacturing hollow flow profiles
US4577684A (en) * 1983-08-12 1986-03-25 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Profiled-tube heat exchanger
US4698888A (en) * 1984-12-22 1987-10-13 Mtu Motoren-Und-Turbinen Union Munchen Gmbh Method for mass producing superimposed annular elements of a tubular manifold or collector vessel of a heat exchanger
US4809774A (en) * 1985-12-12 1989-03-07 Mtu Motoren-Und Turbinen- Union Munchen Gmbh Reversal chamber for a tube matrix of a heat exchanger
US4800955A (en) * 1986-10-20 1989-01-31 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Heat exchanger

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103559A (en) * 1989-05-05 1992-04-14 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Method for making heat exchanger having at least two collecting pipes
US5177865A (en) * 1989-05-05 1993-01-12 Mtu Motoren-Und Turbinen-Union Method for making heat exchanger having at least two collecting pipes
US5269276A (en) * 1992-09-28 1993-12-14 Ford Motor Company Internal combustion engine fuel supply system
US20040035562A1 (en) * 2002-07-12 2004-02-26 Haruyuki Nishijima Heat exchanger for cooling air
US20060225405A1 (en) * 2004-04-22 2006-10-12 Cuva William J Cooling scheme for scramjet variable geometry hardware
US20090133380A1 (en) * 2006-05-09 2009-05-28 Mtu Aero Engines Gmbh Gas Turbine Engine
US20170115065A1 (en) * 2015-10-22 2017-04-27 Hamilton Sundstrand Corporation Heat exchangers
US10190828B2 (en) * 2015-10-22 2019-01-29 Hamilton Sundstrand Corporation Heat exchangers
US20170205157A1 (en) * 2016-01-14 2017-07-20 Hamilton Sundstrand Corporation Thermal stress relief for heat sinks
US11092384B2 (en) * 2016-01-14 2021-08-17 Hamilton Sundstrand Corporation Thermal stress relief for heat sinks
EP4089273A1 (de) * 2021-05-14 2022-11-16 Raytheon Technologies Corporation Rohrhalterung für wärmetauscher
EP4089356A1 (de) * 2021-05-14 2022-11-16 Raytheon Technologies Corporation Rohrhalterung für wärmetauscher
US11859910B2 (en) 2021-05-14 2024-01-02 Rtx Corporation Heat exchanger tube support
US11892250B2 (en) 2021-05-14 2024-02-06 Rtx Corporation Heat exchanger tube support

Also Published As

Publication number Publication date
DE3861453D1 (de) 1991-02-07
ES2019682B3 (es) 1991-07-01
EP0313038A1 (de) 1989-04-26
EP0313038B1 (de) 1990-12-27
DE3735846A1 (de) 1989-05-03
JPH01147295A (ja) 1989-06-08

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